Deploying java applications with docker and kubernetes

The binding between deployments and services is specified by labelsвЂ‰-вЂ‰in this case the The image is the name and tag of the Docker image that you want to use for this container.ДЇinally, the containerPort is the port that your container exposes to access your application.ДЇor the services, the key point to understand is that they expose your deployments. The labels is a way for a Kubernetes service to reference specific deployments. Three key items to look at when creating the deployments are the labels, It defines two deployments and two services.ДЄ Kubernetes deployment is a resource that controls the creation and management of pods.ДЄ service exposes your deployment so that you can make requests to your containers. This file defines four Kubernetes resources.

1 apiVersion: apps/v1 2 kind: Deployment 3 metadata:Д¤ name: system-deployment 5 # tag::labels1 6 labels:Д§ # end::labels1 8 # tag::app1 9 app: system 10 # end::app1 11 spec:ДЎ4 # tag::app2 15 app: system 16 # end::app2 17 template:Дў1 # end::labels2 22 # tag::app3 23 app: system 24 # end::app3 25 spec:Дў7 - name: system-container 28 # tag::image1 29 image: system:1.0-SNAPSHOT 30 # end::image1 31 ports:ДЈ2 # tag::containerPort1 33 - containerPort: 9080 34 # end::containerPort1 35 - 36 apiVersion: apps/v1 37 kind: Deployment 38 metadata:ДЈ9 name: inventory-deployment 40 # tag::labels3 41 labels:Д¤2 # end::labels3 43 # tag::app4 44 app: inventory 45 # end::app4 46 spec:Д¤9 # tag::app5 50 app: inventory 51 # end::app5 52 template:ДҐ6 # end::labels4 57 # tag::app6 58 app: inventory 59 # end::app6 60 spec:Д¦2 - name: inventory-container 63 # tag::image2 64 image: inventory:1.0-SNAPSHOT 65 # end::image2 66 ports:Д¦7 # tag::containerPort2 68 - containerPort: 9080 69 # end::containerPort2 70 - 71 apiVersion: v1 72 kind: Service 73 metadata:Д§6 # tag::NodePort1 77 type: NodePort 78 # end::NodePort1 79 selector:ДЁ0 # tag::app7 81 app: system 82 # end::app7 83 ports:ДЁ4 - protocol: TCP 85 port: 9080 86 targetPort: 9080 87 # tag::nodePort1 88 nodePort: 31000 89 # end::nodePort1 90 91 - 92 apiVersion: v1 93 kind: Service 94 metadata:Д©7 # tag::NodePort2 98 type: NodePort 99 # end::NodePort2 100 selector:ДЎ01 # tag::app8 102 app: inventory 103 # end::app8 104 ports:ДЎ05 - protocol: TCP 106 port: 9080 107 targetPort: 9080 108 # tag::nodePort2 109 nodePort: 32000 110 # end::nodePort2

Deploying java applications with docker and kubernetes